3193 8GB
4.4 MAINTENANCE POSITION, (fig. 11)
Before performing maintenance on the burner, it is
best to disconnect the system’s power supply.
³Unscrew and remove the screw fastening it to the
flange to take the burner off the boiler.
³Hook the burner onto flange (7), loosen screws (5)
and pull off the blast tube assembly (4).
³Loosen screw (3, fig. 14 page 9) to remove the dif-
fuser disc support assembly (3) from nozzle-holder
assembly (1).
³Pull wires (2) out from electrodes.
³Replace nozzle (6) and screw the new one on prop-
erly, holding it as illustrated in figure 11.
³Refit following the above procedure in the reverse
order.
4.5 COMBUSTION HEAD SETTING, (fig. 13)
Combustion head adjustment varies depending on
burner delivery. To adjust, proceed as follows:
³Turn adjusting screw (2) clockwise or anticlockwise
until the notch on the regulating rod (3) is lined up with
the outer surface of the nozzle-holder assembly (1).
³In the example, the regulating rod (3) is set to setpoint
3. This means the burner is adjusted for an output of
2.7 kg/h with a pump pressure of 12 bar using a 0.75
GPH nozzle, as indicated in the reference table relat-
ing to burner type 370T1.
4.6 AIR DAMPER ADJUSTMENT
To adjust the air damper proceed as follows:
³Loosen nut (5, fig. 13) and set the valve by adjusting
the screw (4).
³When the adjustment is complete screw down nut (5).
Type 370T1 - BGK1
When the burner stops, the air damper closes automati-
cally until maximum negative flue pressure is 0.5 mbar.
Type 374T1 - BGK2
When the burner stops, the air damper stays open.
4
3
2
5
6 7
E9286
1
Fig. 11
D7291
Fig. 13 2
1
3
1
4 5
WARNING
In the event of maintenance
made to the diffuser disc-hold-
er assembly, screw the nut (A)
as shown in the figure 12.
A
TIGHTEN WITHOUT MOVING
BACKWARDS TO THE END
D5684
Fig. 12
